get yourself a DX6i. This radio has the largest demand of all 6 channels, provides dual rates and expo on all channels with mixing, and can easily be sold for around 120 bucks should you out grow it. Also, you won't find more receivers than spektrum that people are buying and selling on the internet. The availability of high quality unused receivers at good prices are everywhere. That and you can go to HobbyKing and buy Orange 6 channel receivers for 8 bucks.

Don't get caught up in the hype that Spektrum is unreliable. I've never had one glitch with my old dx6i. Just remember to use more than a 4.8v pack if you're using digital servos.